Building an ADU in Mountain View, CA: Steps, Costs, and Design Inspiration

Accessory Dwelling Units (ADUs) are transforming how homeowners in Mountain View maximize their property’s potential. Whether you want extra space for family, a rental unit for passive income, or a private home office, an ADU can deliver long-term value and flexibility. Here’s an in-depth guide to the process, budgeting, and creative design ideas for your Mountain View ADU project.

Modern ADU interior featuring a compact kitchen with open wood shelving, shiplap walls, exposed ceiling beams, pendant lighting, and a small dining area leading to a cozy living space.

The ADU Process in Mountain View

1. Site Evaluation & Feasibility:

   • EDR Design Build begins with a thorough assessment of your lot, considering zoning, setbacks, and utility access. Mountain View’s ADU-friendly policies make many properties eligible, but each site is unique.

2. Custom Design:

   • Our team collaborates with you to design an ADU that fits your needs and complements your main home. Options include detached backyard cottages, attached additions, or garage conversions.

3. Permitting:

   • We handle the paperwork and navigate Mountain View’s permitting process, ensuring your plans comply with local ordinances and state ADU regulations.

4. Construction:

   • EDR’s experienced crew manages every phase of construction, from foundation to finishes, with a focus on quality and minimal disruption.

5. Final Walk-Through:

   • We review every detail together to ensure your new ADU is move-in ready and meets your expectations.

Budgeting and Timeline Expectations

• Costs:

  • ADU construction costs in Mountain View typically range from $200,000 to $350,000+, depending on size, design, finishes, and site conditions. Detached ADUs are often more expensive than garage conversions or attached units.

  • EDR provides transparent, upfront estimates and helps you identify cost-saving opportunities without sacrificing quality.

• Timeline:

  • Most ADU projects take 6–9 months from initial consultation to completion. Permitting can take 2–3 months, with construction lasting 4–6 months depending on complexity and weather.

• Financing:

  • Home equity loans, cash-out refinancing, and construction loans are common ways to finance an ADU. We can connect you with local lenders familiar with ADU projects.

View from a loft staircase overlooking an open-concept ADU living area with wood flooring, modern seating, bar stools, and a bright, airy layout designed for efficient small-space living.

Why Build with EDR Design Build?

• Local Expertise:

  • We know Mountain View’s zoning, permitting, and design requirements inside and out, ensuring a smooth process.

• Quality & Communication:

  • Our design-build approach means you have one team from start to finish, with clear updates every step of the way.

• Custom Solutions:

  • No cookie-cutter ADUs—your space is tailored to your lifestyle, property, and budget.

Ready to Build Your Mountain View ADU?

Click the button below to get started, or call 650-888-2107 to schedule your consultation.

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